(湖南大學 材料科學與工程學院， 長沙 410082)
摘 要: 采用含有固體食鹽顆粒的氣固兩相流霧化工藝制備不銹鋼粉末，并討論了金屬液流量、 固體介質(zhì)流量、 氣體介質(zhì)流量以及氣壓等工藝參數(shù)對粉末粒度和形貌的影響。 研究結(jié)果表明: 在同等氣體壓力和流量的條件下，與普通氣體霧化相比， 氣固兩相流霧化所得不銹鋼粉末具有更小的粒度和更好的球形度； 隨著氣體介質(zhì)流量及壓力的增加， 所制備的不銹鋼粉末粒度越小， 粉末的分布更集中；隨固體介質(zhì)鹽流量的增大， 所得粉末的粒度呈現(xiàn)先減小后增大的趨勢。 在熔體溫度為1 550 ℃～1 600 ℃， 氣體壓力為0.9 MPa， 氣體介質(zhì)流量為6 m3/min， 金屬液流量為42 g/s，鹽流量為58 g/s條件下， 制備出平均粒徑為20 μm和球形度良好的不銹鋼粉末。
關(guān)鍵字: 氣固兩相流霧化；不銹鋼； 氣霧化
（ School of Materials Science and Engineering,
Hunan University, Changsha 410082, China）
Abstract: A novel gas and solid dual-phase atomization technology with solid salt (NaCl) particles was used to fabricate the stainless steel powders. The effects of the liquid metal flow rate, the solid medium mass flow rate, the gas medium mass flow rate and gas pressure on granularity and morphology of the as-prepared stainless steel powders were discussed. The results show that the finer stainless steel powders with higher sphericity are produced by the gas and solid dual-phase atomization than those produced by the conventional gas atomization technology under the same gas pressure and flowing rate. The stainless steel powder becomes finer and the size distribution is narrower with the mass flow rate and pressure of gas medium increasing. With the increase of the solid medium mass flow rate, the mean size of the as-atomized stainless steel powder tends to decrease firstly and then increase. When the liquid metal temperature is 1 550-1 600 ℃ the pressure of gas with flow rate of 6 m3/min is 0.9 MPa, the molten metal flow rate is 42 g/s and the salt flow rate is 58 g/s, the smooth and spherical stainless steel powders with the grain size of 20 μm are prepared.
Key words: gas and solid dual-phase atomization; stainless steel; gas atomization
